Path: news.eternal-september.org!eternal-september.org!feeder3.eternal-september.org!fu-berlin.de!uni-berlin.de!individual.net!not-for-mail
From: rbowman <bowman@montana.com>
Newsgroups: comp.os.linux.misc
Subject: Re: FAA To Finally Ditch Floppy Disks & Win-95
Date: 23 Jun 2025 19:11:43 GMT
Lines: 22
Message-ID: <mbtn7fFjbqdU3@mid.individual.net>
References: <QS6dnec0X840fdH1nZ2dnZfqn_GdnZ2d@giganews.com>
	<102k8b7$9k0q$1@dont-email.me>
	<5bqcncF-gopLr9P1nZ2dnZfqn_idnZ2d@giganews.com>
	<102mkq6$ul07$2@dont-email.me>
	<vOScnQgBr8PA5tL1nZ2dnZfqnPSdnZ2d@giganews.com>
	<dRY3Q.1260250$6%s6.129451@fx12.iad> <102svmu$2mtm4$2@dont-email.me>
	<7W6dncD4ub0qu8_1nZ2dnZfqnPadnZ2d@giganews.com>
	<mberljF2tnjU1@mid.individual.net> <20250618080351.00007899@gmail.com>
	<NCB4Q.1264685$6%s6.96991@fx12.iad>
	<mpWdnYom68FB0871nZ2dnZfqn_oAAAAA@giganews.com>
	<P705Q.463508$IJr4.95857@fx47.iad> <1033kl9$th0$2@dont-email.me>
	<mblsvbF9qfoU4@mid.individual.net> <10362qd$10ote$5@dont-email.me>
	<DFH5Q.378160$K3w3.127069@fx05.iad> <mbp3ooFqebsU3@mid.individual.net>
	<8judncOVBsnUxsr1nZ2dnZfqnPSdnZ2d@giganews.com>
	<mbpla6Ft9taU1@mid.individual.net> <FCV5Q.1598985$G6Lf.181139@fx17.iad>
	<mbr2nlF5ijfU2@mid.individual.net> <DZ_5Q.1372755$6%s6.27132@fx12.iad>
	<mbs7dgFbafcU2@mid.individual.net> <Xuf6Q.1622915$G6Lf.431992@fx17.iad>
Mime-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
X-Trace: individual.net +WnYKjBDJ8l4DGNG9is13wJe9tljjCjuNEOh4KwFK8l60XNfwU
Cancel-Lock: sha1:0cJL3ax1gJi160HKqX4t+B7PT0U= sha256:B2LoWwMz13sWny8wunx58SOAcG21UU4zO7Ab0dwwx/k=
User-Agent: Pan/0.160 (Toresk; )

On Mon, 23 Jun 2025 16:43:35 GMT, Charlie Gibbs wrote:

> On 2025-06-23, rbowman <bowman@montana.com> wrote:
> 
>> Years ago Trimble was a big player when emergency services started
>> using AVL and they had their own format. Geocom, another player, sent
>> the coordinated in hex. It's been a long time but there was also a
>> magic number involved where x and y were the hex values.
>>
>> 	*lat = (double) x * 5.729577957 * .0000001;
>> 	*lon = (double) y * 5.729577957 * .0000001;
> 
> That number looks suspiciously like the number of degrees in a radian,
> divided by 10.

You're right. I was looking at source code I wrote about 20 years ago 
without giving it much thought. 

Unfortunately, now I'm thinking. I wonder what the raw GNSS data looks 
like? There are a lot of GPS modules for microprocessors but afaik they 
only spit out NMEA sentences. That's no fun.